J/MNRAS/276/57 J/MNRAS/276/57 IRAS Galactic star-forming regions. II. C Codella G G C Palumbo G Pareschi F Scappini P Caselli M R Attolini Mon. Not. R. Astron. Soc. 276 57 1995 1995MNRAS.276...57C II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986) J/A+AS/98/589 : IRAS Sources behind the Solar circle (Wouterloot+ 1993) Infrared sources Masers Radio lines Spectroscopy infrared: ISM: continuum ISM: molecules masers radio lines: ISM stars: formation The results of the analysis of the occurrence of 22.2-GHz H_2_O maser emission in a sample of 1409 IRAS sources north of declination -30deg associated with star-forming regions are presented. Our sample contains all the IRAS sources that satisfy Emerson criteria for selecting molecular cores associated with the earliest evolutionary stages of the star-forming process. In a previous paper (Paper I, 1994MNRAS.266..123P), we have reported the results of the observations of about one third of the sample. In the present paper the observations of the remaining IRAS sources are presented: 18 of them are newly detected maser sources. The results show that 20 per cent of all IRAS sources that satisfy the Wood & Churchwell criteria have H2O water masers. This is in agreement with the assumption that these criteria select objects that are connected with the early phases of the evolution of high-mass star-forming regions. Moreover, about one third of the whole sample selected according to Emerson criteria contains IRAS sources that are not associated with massive star-forming processes, but probably with molecular cores in low-mass star-forming regions.

IRAS IRAS name --- m_IRAS Multilpicity index on IRAS name --- GLON Galactic longitude deg GLAT Galactic latitude deg l_Fpeak Limit flag on Fpeak --- Fpeak Peak flux density Jy n_Fpeak Note on Fpeak number=1 D: Detected as maser by others ND: Not detected as maser by others --- r_Fpeak Fpeak references number=2 References: 1 Present Work 2 Palla et al., 1991A&A...246..249P 3 Felli et al., 1992A&A...255..293F 4 Palla, 1992 (unspecified reference, occurs for IRAS 18134-1652) 5 Comoretto et al., 1990A&AS...84..179C 6 Arcetri Data-base 7 Henning et al., 1992A&AS...93..525H 9 Wouterloot & Walmsley, 1986A&A...168..237W 14 Genzel & Downes, 1977A&A....61..117G 15 Scalise et al., 1989A&A...221..105S 17 Gyulbudaghian et. al., 1990RMxAA..20...51G 19 Wouterloot. et al., 1993A&AS...98..589W, Cat. <J/A+AS/98/589> 20 Palla et al., 1993A&A...280..599P 21 Caswell et al 1983AuJPh..36..443C 22 Churchwell et al., 1990A&ARv...2...79C 23 Knapp & Morris, 1976ApJ...206..713K 24 Jaffe et al., 1981ApJ...250..621J 25 Genzel & Downes, 1979A&A....72..234G 26 Matthews et. al., 1985A&A...149..227M 27 Braz et al., 1989A&AS...77..465B 28 Codella et al., 1994A&A...291..261C 29 Wouterloot et al., 1986A&A...168..237W --- IRAS IRAS name --- Sample Subsample --- l_F12 Limit flag on F12 --- F12 Flux density at 12{mu}m Jy l_F25 Limit flag on F25 --- F25 Flux density at 25{mu}m Jy l_F60 Limit flag on F60 --- F60 Flux density at 60{mu}m Jy l_F100 Limit flag on F100 --- F100 Flux density at 100{mu}m Jy Date Observing date "DD/MM/YY" Fpeak Flux of the strongest component Jy rms Noise of the spectrum Jy Vpeak Velocity of the strongest component km/s FH2O Integrated flux computed over the whole emission interval Jy.km/s James Marcout, Patricia Bauer CDS 1996Nov29 UNKNOWN UNKNOWN Prepared via OCR at CDS. J_MNRAS_276_57.xml